<template>
<li>
  <label>
    <input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
    <!-- 如下代码也能实现功能，但是不太推荐，因为有点违反原则，因为修改了props -->
    <!-- <input type="checkbox" v-model="todo.done"/> -->
    <span>{{todo.title}}</span>
  </label>
  <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>

<script>
export default {
  name: 'Item',
  //声明接收todo、checkTodo、deleteTodo
  props:['todo','checkTodo','deleteTodo'],
  methods: {
    //勾选or取消勾选
    handleCheck(id){
      //通知App组件将对应的todo对象的done值取反
      this.checkTodo(id)
    },
    //删除
    handleDelete(id){
        //通知App组件将对应的todo对象删除
        this.deleteTodo(id)
      // if(confirm('确定删除吗？')){
      // }
    }
  },
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  /* line-height: 36px; */
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}

li:hover{
  background-color: #ddd;
}

li:hover button{
  display: block;
}
</style>
